well, if immigration have already flagged you, it will be totally up to the immigration officer, at point of entry, whether to let you in or not. Most probably, your name is down in the system already....good luck
check with your embassy/consulate. If you want to play games with immigration, it's totally up to you. Many countries get 60 days + 30. You could leave, and enter again for a further 60+30.....if Immigration officer will allow that
I do/did the same in Trat, Chiang Mai and Krabi!! Walk in, get a list of documents they need. Go home, prepare docs and head back to local immigration....no problems whatsoever. But it seems to be too much hassle for many people!!